docs: def get(self, key):
          """ Fetch entry from database. """
          c = self.conn.cursor()
          for row in c.execute("SELECT key, nonce, key_handle, aead, oath_C, oath_T FROM oath WHERE key = ?", (key,)):
              return ValOathEntry(row)
          raise Exception("OATH token for '%s' not found in database (%s)" % (key, self.filename))